When Hollywood star Robert Downey Jnr won the part of Tony Stark ingenious engineer turned comic book superhero Iron Man he says there was only one muse who came to mind.

Silicon Valley geek turned multi-billionaire Elon Musk may not have invented a super-powered armoured suit with which to save us all, but hes just about thought of everything else.

Musk, the 80th richest person in the world, worth 11billion has made safeguarding the world his business, with an eclectic catalogue of far-out ideas.

The first step is to establish that something is possible, he insists with indomitable superhero confidence.

Theres his 36.44billion electric and self-drive car business Tesla, speeding towards an eco-friendly horizon and saving us from our toxic selves.

Alongside sits SpaceX, Musk s foray into the universe, which aims to send us to Mars in reusable rockets, settling a million people there by the mid-2060s.

And then theres the most futuristic of all, Musks medical research company Neuralink, which aims to connect human brains with computers.

Recently, he joined Donald Trumps Manufacturing Jobs Initiative as an advisor and he is also part of the US Presidents economic advisory board.

Meanwhile, as Musk drags the world into the future at a speed to rival his rockets, his personal life is mirroring the breakneck trajectory.

At 45, hes already been married three times twice in the space of three years to British St Trinians actress Talulah Riley. And most recently, hes been linked to Johnny Depps ex, actress Amber Heard .

Musk says total lack of fear lies behind his fast-fuelled decision-making and achievements. Fear is finite, hope is infinite. We are afraid of failing, but it doesnt stop us from trying, he once said.

People should certainly ignore fear if its irrational. Even if its rational and the stake is worth it, its worth proceeding.

South African by birth, the entrepreneur was raised by his engineer dad Errol and dietician and model mum Maye.

He has a younger brother Kimbal, also an entrepreneur and millionaire, and younger sister Tosca, a film producer.

Born in 1971, by the age of 10 long before computers became mainstream childs play Musk showed an interest, and just two years later taught himself computer programming.

His first creation was a video game called Blaster, which, at age 12, he sold for 400. I have two brilliant children, but Elons a genius, said Maye.

I can explain Tosca and Kimbal pretty well. I cant explain Elon.

Maye and Errol split when the children were young and they remained with their dad. It has been reported Errol was very strict, but he describes a young son always naturally dedicated to study.

Errol said: Elon has always been an introvert thinker. So where a lot of people would go to a party and have a great time, and drink and talk about all sorts of things like rugby or sport, you would find Elon had found the persons library and was going through their books.

Because he was so bright, Musk was sent to school early, the youngest and the smallest. He was relentlessly bullied.

He has described being thrown down a concrete stairwell and ending up in hospital. Aged 18, he moved to Canada, where he had an uncle.

Musk studied at Queens University, in Ontario, and, after graduation, moved to Californias Silicon Valley, armed with capital from his father.

Aged just 27, he sold his first co-founded company, Zip2, to Compaq in 1999 for 246million, earning him 14million.

PayPal, originally X.com, was to follow. Musk co-founded the online payments company and sold it for 1.2billion in 2002, making 132million from the deal.

Meanwhile, he was moving fast in his personal life, too. He met his first wife, Justine Wilson, at university.

They married in 2000. Author Justine gave birth to their first son Nevada in 2002, but at 10 weeks old, he died of sudden infant death syndrome.

Justine has said Musk bottled up his grief. Elon made it clear he did not want to talk about Nevadas death.

I didnt understand this, just as he didnt understand why I grieved openly, which he regarded as emotionally manipulative, she said.

But, with IVF, in the next five years, they had twins Xavier and Griffin, and triplets Damian, Saxon and Kai. Despite their joy, their marriage foundered.

Elon does what he wants and he is relentless about it, Justine said. Its Elons world and the rest of us live in it. They divorced in 2008.

Musk sped into love again this time with Talulah. That same year, he met the 22-year-old star in a London club. Just a few weeks later, on a hotel bed in Beverly Hills, he asked her to marry him. He didnt have a ring, so they shook hands.

It is said at work he is ferocious, He works 80 to 100 hours a week and tells employees: I want your head to hurt every night when you go to bed.

Perhaps, unsurprisingly, his relationship with the actress has been a roller-coaster ride. They married in 2010, but divorced in 2012 only to remarry again the following summer.

She then filed for divorce again in 2014, then withdrew it, and then filed another time.

It probably looks mad from the outside but it hasnt put either of us off marriage. We are both very romantic people, Talulah explained.

Musk argues virtual reality is already approaching being indistinguishable from reality.

Certainly, his own star is sky-rocketing so fast its hard to decipher whats science fiction and what is not.

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Cheap space travel, electric cars and a whirlwind love life love life... the billionaire genius inventing our future - Mirror.co.uk